Claude Opus 5.5 vs Kimi K2 Thinking
At a Glance
| Compare | Claude Opus 5.5Anthropic |  Kimi K2 ThinkingMoonshot AI |
|---|---|---|
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $4.00Anthropic ↗ · Sep 22, 2026 | $0.60Openrouter ↗ · Sep 23, 2026 |
| Output priceFrom · USD / 1M tokens | $20.00Anthropic ↗ · Sep 22, 2026 | $2.50Openrouter ↗ · Sep 23, 2026 |
| Context windowMaximum documented tokens | 1,000K | 262K |
| Model facts checked | Sep 22, 2026View model evidence → | Aug 28, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
Available Benchmarks
Side-by-Side Facts
| Field | Claude Opus 5.5 | Kimi-K2-Thinking |
|---|---|---|
| Developer | Anthropic | Moonshot AI |
| Family | Claude 5 5 | Kimi K2 Thinking |
| Model | Claude Opus 5.5 | Kimi-K2-Thinking |
| Version | Claude Opus 5.5 | Kimi-K2-Thinking |
| Lifecycle | active | active |
| Released | 2026-09-22 | 2025-11-06 |
| Knowledge cutoff | 2026-06-01 | Unknown |
| Input modalities | Text, Image | Text |
| Output modalities | Text | Text |
| Context window | 1,000K | 262K |
| Total parameters | Unknown | 1T |
| Active parameters | Unknown | 32B |
| License | Unknown | other |
| Open weights | No | Yes |
| API available | Yes | Yes |
| Self-hostable | No | Yes |
| Provider access | Anthropic (Standard) | Hugging Face (Standard), Openrouter (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, generation, reasoning, tools |
| Message Batches max output (beta) | 300000 tokens | Unknown |
| Default effort | medium | Unknown |
| Retirement commitment | Not sooner than September 22, 2027 | Unknown |
| Thinking | Adaptive (always on) | Unknown |
Claude Opus 5.5 Capabilities
Kimi K2 Thinking Capabilities
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Primary Evidence
Sources and Freshness
Questions
Claude Opus 5.5 vs Kimi K2 Thinking FAQs
Is Claude Opus 5.5 or Kimi K2 Thinking better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Opus 5.5 and Kimi K2 Thinking, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Opus 5.5 or Kimi K2 Thinking?+
Claude Opus 5.5 is $4.00 and Kimi K2 Thinking is $0.60 per million tokens, so Kimi K2 Thinking is cheaper on this metric. Claude Opus 5.5 is $20.00 and Kimi K2 Thinking is $2.50 per million tokens, so Kimi K2 Thinking is cheaper on this metric.
Which has a larger context window, Claude Opus 5.5 or Kimi K2 Thinking?+
Claude Opus 5.5 has the larger sourced context window. Claude Opus 5.5 supports 1,000K and Kimi K2 Thinking supports 262K.
Which performs better in benchmarks, Claude Opus 5.5 or Kimi K2 Thinking?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can Claude Opus 5.5 or Kimi K2 Thinking be self-hosted?+
Kimi K2 Thinking is the only model in this pair currently marked as self-hostable. Claude Opus 5.5 is not marked open weight; Kimi K2 Thinking is open weight.
Can Claude Opus 5.5 and Kimi K2 Thinking understand images?+
Claude Opus 5.5 is documented with image input; Kimi K2 Thinking is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Opus 5.5 or Kimi K2 Thinking?+
Kimi K2 Thinking has the larger sourced maximum output: Claude Opus 5.5 supports 128K and Kimi K2 Thinking supports 131K output tokens.
Do Claude Opus 5.5 and Kimi K2 Thinking support reasoning and tool use?+
Claude Opus 5.5: reasoning, tool calling, and image input. Kimi K2 Thinking: reasoning and tool calling. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Opus 5.5 or Kimi K2 Thinking?+
Claude Opus 5.5 has 1 sourced provider route; Kimi K2 Thinking has 2, so Kimi K2 Thinking has broader tracked availability.
Which offers better value, Claude Opus 5.5 or Kimi K2 Thinking?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.